Dropping Motion files into Avid

Hi I've recently discovered you can drag n drop motion files into bins in Avid in the same way you would with FCP. I tried this for the first time today and after Avid had processed the motion file it opened ok. However the motion file (a lower third) looked over-stretched and I had to edit the matte effect (created by avid) to resize it to look correct. As this was the first time I've tried this I don't know if did anything wrong on either the Motion or Avid side of things. The project setting in Motion was DV SD broadcast Pal/CCIR 601 & edited project setting to anamorphic. The Avid project was also DV PAL anamorphic. Avid took a long time to process the file. I was using Motion 3 and Avid Xpress Pro. Any tips on this will be well appreciated. Thanks.